diff --git a/qse/include/qse/cmn/fio.h b/qse/include/qse/cmn/fio.h
index 0b7e5d2a..ce62459f 100644
--- a/qse/include/qse/cmn/fio.h
+++ b/qse/include/qse/cmn/fio.h
@@ -59,9 +59,10 @@ enum qse_fio_open_flag_t
 	QSE_FIO_NOSHRD        = (1 << 24),
 	QSE_FIO_NOSHWR        = (1 << 25),
 
-	/* for WIN32 only. harmless(no effect) when used on other platforms */
+	/* hints to OS. harmless(no effect) when used on unsupported platforms */
 	QSE_FIO_RANDOM        = (1 << 26), /* hint that access be random */
-	QSE_FIO_SEQUENTIAL    = (1 << 27)  /* hint that access is sequential */
+	QSE_FIO_SEQUENTIAL    = (1 << 27), /* hint that access is sequential */
+	QSE_FIO_NOCACHE       = (1 << 28)  /* no system I/O cache */
 };
 
 enum qse_fio_std_t
diff --git a/qse/lib/cmn/fio.c b/qse/lib/cmn/fio.c
index bd129601..73517305 100644
--- a/qse/lib/cmn/fio.c
+++ b/qse/lib/cmn/fio.c
@@ -155,6 +155,8 @@ int qse_fio_init (
 			flag_and_attr |= FILE_FLAG_RANDOM_ACCESS;
 		if (flags & QSE_FIO_SEQUENTIAL) 
 			flag_and_attr |= FILE_FLAG_SEQUENTIAL_SCAN;
+		if (flags & QSE_FIO_NOCACHE)
+			flag_and_attr |= FILE_FLAG_NO_BUFFERING;
 
 		handle = CreateFile (
 			path, desired_access, share_mode, 
@@ -369,6 +371,20 @@ int qse_fio_init (
 
 	if (handle == -1) return -1;
 
+	/* set some file access hints */
+	#if defined(POSIX_FADV_RANDOM)
+	if (flags & QSE_FIO_RANDOM) 
+		posix_fadvise (handle, 0, 0, POSIX_FADV_RANDOM);
+	#endif
+	#if defined(POSIX_FADV_SEQUENTIAL)
+	if (flags & QSE_FIO_SEQUENTIAL) 
+		posix_fadvise (handle, 0, 0, POSIX_FADV_SEQUENTIAL);
+	#endif
+	#if defined(POSIX_FADV_DONTNEED)
+	if (flags & QSE_FIO_NOCACHE) 
+		posix_fadvise (handle, 0, 0, POSIX_FADV_DONTNEED);
+	#endif
+
 #endif
 
 	if (flags & QSE_FIO_TEXT)